MAS1L and metabolic dysfunction-associated steatohepatitis: Additionally, 88% of S.A. Bscl2Celia/Celia mice showed MASL, of which 25% developed MASH, whereas only 20% of S.A. Bscl2+/Celia mice showed signs of MASL, never progressing to steatohepatitis (Figure 4C).